I'm subscribed to many threads using instant email notification and haven't had an email from ECF for 2 days.
Click on 'Settings' at the top of the page and you'll get a list of all you subscribed threads with new posts.
From that page click on 'Subscriptions' to see all the threads you're subscribed to.
Just went looking and found this:
http://www.e-cigarette-forum.com/forum/site-feedback-help/633087-no-thread-updates.html
So relax, fellow oldsters, it really is happening, it's not CRS!